A tire comprising a tread

Abstract

A tire having improved grip on low and high wet temperature conditions is provided, wherein each tread pattern element ( 1 ) of a tread of the tire comprises a first rubber composition (FC) at least partially covered on at least one lateral face ( 13, 14, 15, 16 ) with a layer of a second rubber composition (SC) which is based on more than 50 phr and up to 100 phr of a butyl rubber, no the diene elastomer or less than 50 phr of another diene elastomer which is different from the butyl rubber, a reinforcing filler comprising more than 60 phr of a reinforcing inorganic filler, and a plasticizing agent comprising more than 25 phr of a hydrocarbon resin having a glass transition temperature of more than 20° C., and comprising no liquid plasticizer or comprising at most 15 phr of a liquid plasticizer.

1 .- 19 . (canceled) 
     
     
         20 . A tire comprising a tread which comprises a plurality of tread pattern elements delimited by cut-outs, the tread pattern elements respectively comprising at least one lateral face and a contact surface configured to come into contact with the ground during rolling, and the tread pattern elements respectively comprising a first rubber composition at least partially covered on at least one of the lateral faces with a layer of a second rubber composition which is different from the first rubber composition,
 wherein the second rubber composition is based on:
 more than 50 phr and up to 100 phr of a butyl rubber; 
 no other diene elastomer or less than 50 phr of another diene elastomer which is different from the butyl rubber; 
 a reinforcing filler comprising more than 60 phr of a reinforcing inorganic filler; and 
 a plasticizing agent comprising more than 25 phr of a hydrocarbon resin having a glass transition temperature of more than 20° C. and comprising no liquid plasticizer or comprising at most 15 phr of a liquid plasticizer. 
   
     
     
         21 . The tire according to  claim 20 , wherein the second rubber composition is based on 70 to 100 phr of the butyl rubber. 
     
     
         22 . The tire according to  claim 20 , wherein the butyl rubber is a halogenated butyl rubber. 
     
     
         23 . The tire according to  claim 20 , wherein the other diene elastomer is selected from the group consisting of natural rubber, synthetic polyisoprenes, polybutadienes, butadiene copolymers, isoprene copolymers and mixtures thereof. 
     
     
         24 . The tire according to  claim 23 , wherein the other diene elastomer is selected from the group consisting of polybutadienes, butadiene copolymers, isoprene copolymers and mixtures thereof. 
     
     
         25 . The tire according to  claim 23 , wherein the other diene elastomer is selected from the group consisting of natural rubber, synthetic polyisoprenes and mixtures thereof. 
     
     
         26 . The tire according to  claim 20 , wherein the reinforcing filler comprises between 80 and 160 phr of the reinforcing inorganic filler. 
     
     
         27 . The tire according to  claim 20 , wherein the reinforcing inorganic filler comprises from 50 to 100% of silica by weight of the reinforcing inorganic filler. 
     
     
         28 . The tire according to  claim 27 , wherein the reinforcing inorganic filler comprises 100% of silica by weight of the reinforcing inorganic filler. 
     
     
         29 . The tire according to  claim 20 , wherein the reinforcing filler comprises less than 20 phr of carbon black. 
     
     
         30 . The tire according to  claim 20 , wherein the second rubber composition is based on more than 40 phr of the plasticizing agent. 
     
     
         31 . The tire according to  claim 30 , wherein the second rubber composition is based on more than 50 phr of the plasticizing agent. 
     
     
         32 . The tire according to  claim 20 , wherein the plasticizing agent comprises between 25 and 100 phr of the hydrocarbon resin. 
     
     
         33 . The tire according to  claim 20 , wherein the hydrocarbon resin has the glass transition temperature of more than 30° C. 
     
     
         34 . The tire according to  claim 20 , wherein the hydrocarbon resin is selected from the group consisting of cyclopentadiene homopolymer or copolymer resins, dicyclopentadiene homopolymer or copolymer resins, terpene homopolymer or copolymer resins, C 5  fraction homopolymer or copolymer resins, C 9  fraction homopolymer or copolymer resins, alpha-methyl styrene homopolymer or copolymer resins, and mixtures thereof. 
     
     
         35 . The tire according to  claim 20 , wherein the plasticizing agent comprises no liquid plasticizer or comprises at most 10 phr of the liquid plasticizer. 
     
     
         36 . The tire according to  claim 35 , wherein the plasticizing agent comprises no liquid plasticizer or comprises at most 5 phr of the liquid plasticizer. 
     
     
         37 . The tire according to  claim 36 , wherein the plasticizing agent is devoid of the liquid plasticizer. 
     
     
         38 . The tire according to  claim 20 , wherein the layer of the second rubber composition has a thickness which is more than 0.1 mm.